Questions and Answers on Reading Red Dragonfly

Among insects, dragonflies have a unique way of flying. Not only the flying speed is amazing, but also the leisurely flying posture is often unpredictable, especially when changing direction, you can still complete beautiful flying movements. They can fly short distances; Can also be rotated in groups; Sometimes you slide forward and turn around, and sometimes you fly vertically upwards to catch flies at the same speed.

They mate in flight, often fly together, and the most surprising thing is their flight endurance. An entomologist once described them like this: Every day for several months, when the sun first shone, they began to fly nonstop and only took a rest at night (in bad weather, occasionally during the day). Some dragonflies are good at traveling. They can fly tens of millions of kilometers from one continent to another.

Dragonflies have extremely developed pterygoid muscles and airbags on the back of their abdomen. Air is stored in airbags, which can regulate their body temperature, which is also the secret of keeping them in the air effortlessly. As Paul Robert said, "This is why insects can fly freely in the air for so long. Maybe that's why they always fly when there is sunshine! " ! Otherwise, once the temperature drops, their proportion will increase. "

Dragonflies' developed heads and more developed eyes constitute a real helmet, which enables them to observe everything around them. Dragonflies have 20,000 to 30,000 single eyes, and each eye is connected with the nerve endings of the brain. This explains the superb skills of dragonflies and why other predators are difficult to get close to them. In addition, they have a slender neck connected to the chest, which usually shrinks behind the head, so the dragonfly's head is extremely flexible.

Dragonflies, with their superb flying skills and powerful chewing mouthparts, have undoubtedly become a terrible predator among birds compared with raptors. So, what do they eat? They prey on live insects in flight, mainly flies, mosquitoes and butterflies. They seem to be very afraid of insects with poisonous glands, such as bees and scarabs. Dragonflies also eat each other. Although this is not common, there is a law of the jungle after all.

Dragonflies are so good at flying, but their larvae (called hydras) can only grow in water: the unique "face cover" makes these hydras become bullies in the pond, and the gills at the end of their abdomen are their breathing organs. Dragonflies shed their shells many times from hydra to adult, ranging from seven to fifteen times. At this time, the dragonfly began to leave the water, bid farewell to yesterday's aquatic life and began to live in the air.

In general, the life cycle of dragonflies is one year, adults generally live to the end of spring or summer, and their eggs can survive autumn and winter until the early spring of the following year. Dragonflies in Europe generally breed two generations a year. Some species of dragonflies can have a life cycle as long as three, four or even five years.

So, who are the natural enemies of dragonflies? Facts tell us that in the world of life, any meat eater can only be a victim compared with his more powerful opponent. For example, fish, especially bream, trout and perch all prey on dragonfly larvae, and for female adults, they may encounter these nemesis when laying eggs in water.

Frogs and shrews (qújοng) also seem to prefer to prey on dragonflies, webbed feet and wading birds also feed on hatching hydras, while adults are often hunted by falcons.

As we all know, kingfishers are best at preying on dragonfly larvae among songbirds. Paul Robel wrote, "I found eight emerging larvae in the kingfisher's stomach. This beautiful kingfisher also brought the adults of dragonflies to their children. In their nests, you can often find a lot of wing membranes and leftovers from family banquets. "

Insects, such as Mylabris, water ants, lice and bedbugs, also attack dragonflies.

There are hundreds of dragonflies over Europe and thousands in the tropics, at the source of the Amazon River and at the foot of the Himalayas! Dragonflies fly almost everywhere except the north and south poles!

1. Explain that things should be good at grasping characteristics. What are the characteristics of the flight of "Dragonfly" in the selected text?

Some people think that the part about natural enemies of dragonflies can be deleted. What do you think of this? Please explain the reason in simple words. (3 points)

3. Talk about the expressive function of the added words in the following sentences.

At this time, the dragonfly began to leave the water, bid farewell to yesterday's aquatic life and began to live in the air.

The words added in the following sentences are very accurate. Why?

They prey on live insects in flight, mainly flies, mosquitoes and butterflies.

16. Fast, leisurely, free and unpredictable. (2 points)

17. Cannot delete. This is the author's introduction to dragonflies from their living conditions. (3 points)

18. The author vividly explained the life habits of adult dragonflies by anthropomorphic rhetoric, and received vivid expression effect. (3 points. It is enough to grasp personification rhetoric and illustrate this point vividly. )

19. "mainly" accurately shows that these insects account for the vast majority in the dragonfly's diet, and it does not rule out preying on other insects. (2 points. Combine the context with the "accurate" explanation, that is,

Quote snow and wind (2nd floor) 16. Fast, leisurely, free and unpredictable. (2 points) 17. Cannot delete. This is the author's introduction to dragonflies from their living conditions. (3 points) 18. The author vividly explained the life habits of dragonfly adults with anthropomorphic rhetoric, and received vivid expression results. (3 points. It is enough to grasp personification rhetoric and illustrate this point vividly. ) ...